Spinneret for the manufacture of rayon



March 20, 1934. K. WITTE 1,952,025

SPINNERET FOR THE MANUFACTURE OF RAYON Filed Jan 9, 1951 INVENTOR KURT W/TTE ATTORN EY Patented Mar. 2%, 1934 'srATEs ories SPINNERET FGR THE MANUFACTURE OF KAYON Application January 9, 1931, Serial No. 507,560 In Germany January 17, 1930 2 Claims.

"The spinnerette described hereafter serves for the manufacture of rayon, especially viscose rayon. It has been ageneral custom in the rayon industry to use spinnerettes in the form of cups (cylinders) consisting of precious metals or of metal alloys, at the bottom of which are the spinning holes. It is also well known that the spinnerette wall may consist of a less expensive metal,

or-even glass, and a spinneret bottom of precious metal plated on the spinning plate carrier. In those cases where the cylinder consisted of metal a spinnerette bottom provided With a rim has been edged on the cylinder. If the spinnerette plate carriers consisted of glass, the bottoms have been 7 melted directly to the cylindrical glass case.

My new spinnerette is made of different materials. The spinnerette cylinder is constructed of a comparatively cheaper material, such as a material which is resistant to acid and alkali, consisting for the most part, of ordinary metal or metal alloys such as nickel, monel-metal or of those steel sheets known in the industry as being resistant to acids; whereas the spinnerette bottom containimg, the spinning holes consists of a precious metal or a precious metal alloy.

This device has for its purpose the provision of an exchangeable, expensive spinnerette plate. This is not possible when the plate is melted into the glass case nor if the spinnerette bottom was edge on to the spinnerette cylinder, because these operations cause the bottom to be deformed or damaged considerably.

In my new spinnerette, the bottom consists -01? a simple plate containing the spinning holes.

For the purpose of fixing the plate firmly into the plate carrier or cylinder, the spinnerette plate ;itself is not changed or deformed. In its stead @the spinnerette plate is fixed by giving the cylindrical cap a suitable treatment. For this pur- 1. -pose the upper rim of the cap is edged on the spinnerette plate, which edging may be accom- ,plished after enlarging the cap to soine extent, or else the upper rim of the cap is opened from finside to the diameter of the spinnerette plate so that it forms a firm and annular base, after which the outer rim of the cap may be edged on, pressed in or rubbed into the plate rim. The plate may be fixed in any desired fashion to the upper rim of the cap, but the main point is that only the cheaper material is handled for the setting of the plate, whereas the precious spinnerette plate should be unchanged and untouched. The spinnerette holes in this new spinnerette may be drilled and then rubbed in in the usual way. A special form is to set into the spinnerette plate special hole carriers in the form of small precious stones, semiprecious stones, or even very hard glass, each of which is having the corresponding fine spinnerette opening. I have illustrated a mole red form of my device in the accompanying drawing, in which the figure thereon discloses a cross-sectional view of the device. The numeral 5 indicates the draw-plate of a spinning nozzle, which plate 5 is attached to the cylindrical portion 6. The periphery of the plate. (5) is larger than the inner diameter of the cap (6). In order that (5) may be inserted into (6), the cylindrical edge (7) is widened. This may be, accomplished by any suitable means, as, for instance, melting, pressing, rolling or rub: bing. By this means, a suitable opening, the outer rim (9) of the opening is edged over the plate rim in roll form, or pressed on. It will be found advisable to round out the plate rim.

The spinning holes (11) may be drilled and, rubbed into the spinnerette plate directly. In--" stead of this, the spinnerette bottom (5) may be provided with small precious and semiprecious stones or glass bodies made of very hard glass; watch jewels, etc., which are set into the spin-.. nerette bottom and each or" which carries an opening. I

The ordinary spinnerette bottoms are generally fiat plates, but this does not exclude the possibility that they have special incisions such as is as needed for making the spinning holes, etc.

In order to be able to exchange the precious spinnerette bottom, various means may be used. They may be removed by pressing the bottom out from the interior of the cylinder by using a suit: able stamp. Or, further, the outer rim which had been edged or rubbed on may be rubbed Oil or ground off thus freeing the spinnerette bottom which Will come off by itself, or through the use of a slight pressure. The rim need not be ground off completely for this purpose. According to the way the spinnerette plates have been removed, the less precious caps may either be discarded, or, if they are still in good condition, may be treated so that they may be used again.

Having now described my invention in the manner required by the patent statutes, what I desire to claim is:

1. A spinneret for use in the manufacture of artificial filaments comprising a hollow casing;

having a radially extending end flange of greater diameter than the casing, and a spinneret plate of substantially the same diameter as the casing dctachably mounted in said flange.

2. A spinneret for use in the manufacture or metal and relatively thin as compared to the thickness of the casing, whereby said flange may be bent over the edges of the plate, and said spinneret may be detachably mounted in the casing against said shoulder.

KURT WITTE. 

